| County | Water Source |
| Anderson | Clear Creek Spring |
| Carter | Hampton Spring, Valley Forge Spring, and Big Spring |
| Cumberland | Holiday Hills Lake |
| Davidson | Cumberland River |
| DeKalb | Smithville City Reservoir |
| Dyer | Memphis Sand Aquifer |
| Hamilton | Tennessee River |
| Knox | Tennessee River |
| Madison | Cumberland River |
| Maury | Duck River |
| Montgomery | Cumberland River |
| Putnam | Center Hill Lake |
| Rutherford | Stones River and J. Percy Priest Lake |
| Shelby | Memphis Sand Aquifer |
| Sullivan | South Fork Holston River |
| Sumner | Old Hickory Lake |
| Washington | Watauga River and Unicoi Springs |
| Williamson | Cumberland River |